12278228 has 24 divisors (see below), whose sum is σ = 23033472. Its totient is φ = 5711904.

The previous prime is 12278221. The next prime is 12278249. The reversal of 12278228 is 82287221.

It is a junction number, because it is equal to n+sod(n) for n = 12278194 and 12278203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 5207.

It is an arithmetic number, because the mean of its divisors is an integer number (959728).

Almost surely, 2^12278228 is an apocalyptic number.

It is an amenable number.

12278228 is a deficient number, since it is larger than the sum of its proper divisors (10755244).

12278228 is a wasteful number, since it uses less digits than its factorization.

12278228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671 (or 3669 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 12278228 is about 3504.0302510110. The cubic root of 12278228 is about 230.6987446154.

The spelling of 12278228 in words is "twelve million, two hundred seventy-eight thousand, two hundred twenty-eight".